| Issue |
Emergent Scientist
Volume 4, 2020
|
|
|---|---|---|
| Article Number | 2 | |
| Number of page(s) | 7 | |
| Section | Physics | |
| DOI | https://doi.org/10.1051/emsci/2020001 | |
| Published online | 14 July 2020 | |
Research Article
Bimetallic ammeter: a novel method of current measurement
St. Joseph’s Institution,
38 Malcolm Road,
Singapore
308274,
Singapore
* e-mail: robertfrederikduy@gmail.com
Received:
22
February
2020
Accepted:
3
June
2020
An electric current flowing through a bimetallic coil heats it up, and due to thermal expansion, the coil either unwinds or winds depending on the direction of net heat transfer and the specific heat capacities of the metals used. This means that by relating a certain measure of its mechanical displacement with current, the bimetallic coil can be used as an ammeter. Thus, a mathematical model relating the current to the time taken by the bimetallic coil to unwind a fixed displacement was developed and verified through experiments, which show a good agreement between theoretical and experimental values.
Key words: Bimetallic ammeter / current measurement / thermal expansion / heating effect of current / mechanical displacement
© R.F. Uy et al., Published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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